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Unformatted text preview: 2CO2 3H2O FIGURE 166 The changes in the number of moles of the components during a chemical reaction are proportional to the stoichiometric coefficients regardless of the extent of the reaction. That is, the change in the number of moles of a component is one-millionth (e 10 6) of the stoichiometric coefficient of that component in this case. Substituting the relations in Eq. 168 into Eq. 166 and canceling e, we obtain
nC g C nD g D nA g A nB g B 0
(169) This equation involves the stoichiometric coefficients and the molar Gibbs functions of the reactants and the products, and it is known as the criterion for chemical equilibrium. It is valid for any chemical reaction regardless of the phases involved. Equation 169 is developed for a chemical reaction that involves two reactants and two products for simplicity, but it can easily be modified to handle chemical reactions with any number of reactants and products. Next we analyze the equilibrium criterion for ideal-gas mixtures. 162 THE EQUILIBRI...
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This note was uploaded on 06/15/2009 for the course MAE 3311 taught by Professor Hajisheik during the Summer '08 term at UT Arlington.
- Summer '08